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Stability of I and SR Radiophases in Cement Matrices

Published online by Cambridge University Press:  15 February 2011

M.W. Barnes ,
B.E. Scheetz ,
L.D. Wakeley ,
S.D. Atkinson  and
D.M. Roy
M.W. Barnes
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802
B.E. Scheetz
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802
L.D. Wakeley
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802
S.D. Atkinson
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802
D.M. Roy
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802
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Abstract

The following study is a portion of a comprehensive research program that is examining the stability of a variety of nuclear waste forms. In addition to the bulk waste forms, important individual radiophases are being studied to obtain a more complete understanding of the behavior of the components of complex multiphase radwaste systems. The stability of the strontium radiophase in supercalcine and an iodine-radiophase will be discussed.

The strontium radiophase in this study was Sr-powellite and the iodine radiophase was I-sodalite. Each radiophase was incorporated into bulk compositionally adjusted portland and aluminate cements. Two processing variables were studied: curing at 60°C and warm pressing at 150°C and 345 MPa.

Sr-powellite in portland cement leaches incongruently; a combination of dissolution and diffusion-controlled exchange of Ca for Sr is demonstrated. In the warm-pressed aluminate cement these reactions are masked by reactions with the curing cement. I-sodalite leaching data indicate dissolution, dominant at long times, combined with diffusion, dominant at short times.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 6: Symposium D – Scientific Basis for Nuclear Waste Management IV , 1981 , 147
Copyright
Copyright © Materials Research Society 1982

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References

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